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L Avenue Bridge

Iowa Bridge Number 77840

L Avenue Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 1, 2009

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Key Facts

Facility Carried / Feature Intersected
L Avenue Over Railroad (Union Pacific)
Location
Rural: Boone County, Iowa: United States
Structure Type
Metal Rivet-Connected Double-Intersection Warren Pony Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
47 Feet (14.33 Meters)
Structure Length
130 Feet (39.62 Meters)
Roadway Width
17.7 Feet (5.39 Meters)
Spans
1 Main Span(s) and 6 Approach Span(s)
NBI Number
77840

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

Often, when a highway crosses a railroad, the railroad company was still responsible for the design and construction of a bridge to form a grade separation, as opposed to having the road owner design and construct the bridge. Such bridges tend to display unusual design features because as highway bridges they are often lighter weight bridges than bridges built to carry trains, while still displaying a railroad company thinking in terms of bridge design. Surviving examples tend to be significant and worthy of preservation, and the L Avenue Bridge is no exception. The unusual bridge is one of two in the similar bridges county (the other was not documented by HistoricBridges.org). The L Avenue Bridge consists of diagonal members composed of paired, riveted angles and a top chord and end post composed of a combination of riveted angles and plate. The utilitarian design and lack of lattice and v-lacing is typical of many highway over railroad bridges designed by railroad companies.

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Photo Galleries and Videos: L Avenue Bridge

 
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